The causes of lower limb weakness are usually the following: 1, lumbar disc protrusion: If you sit or half lie down for a long time, it may lead to lumbar disc protrusion, it will also compress the sciatic nerve, leading to radiating pain and numbness in the hip, lower limbs and feet, there will also be symptoms of lower limb weakness. Treatment can be given to Siwei Pu pain relief, Flurbiprofen Babu cream topical analgesia, ultrasonic drug introduction, Chinese medicine foot soak, Chinese medicine cupping, lumbar spine traction and other physical therapy to relieve symptoms; 2, trace element deficiency: if calcium or potassium deficiency, will cause lower limb weakness, need to consult the hospital, check biochemical to see if there is a lack of potassium or calcium deficiency. If there is potassium deficiency, replenish potassium ions. If there is calcium deficiency, calcium tablets can be given to replenish calcium; 3, blood system diseases: if the platelets or hemoglobin is too low, causing weakness of the lower limbs may also be accompanied by bleeding spots, you need to consult the hospital to check the blood routine to clarify the cause and treat the symptoms.